In this paper, we will present our approach to develop a new class of solar cells with dynamic optical properties. We have synthesized new organic photosensitizers showing photochromic properties and incorporated them into dye-sensitized solar cells. We obtained semi-transparent solar cells able to self-adapt autonomously their light transmission and energy production according to daylight variations. We will discuss the synthesis of the new photochromic photosensitizers, their optical and electronic properties, and we will present the development of photochromic semi-transparent mini-modules using them.
In order to obtain a red emission with organic electroluminescent device, we realized multilayer structures using various Europium complexes as emitting layer. The multilayer structures were obtained with the emitting layer deposited on a ITO substrate; a 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) layer was used as hole blocking layer and a tris-(8-hydroxyquinoline) aluminium (Alq3) layer as electron transport layer. Cathode of the devices was realized with a calcium layer covered with an protective aluminium layer.
Two different europium complexes have been tested:
Eu (TTA)3 phen (TTA = thenoyltrifluoroacetone),
Eu (DTP)3 (dipphen) (DTP = 1,3-di(2-thienyl)propane-1,3-dione, dipphen = 4,7-Diphenyl-1,10-phenanthroline)
The Europium complexes were inserted in a poly-9-vinylcarbazole (PVK) matrix and the "spin-coating" process was used to obtain the emitting layers.
The maximum emission of the OLEDs are centered around 610 nm according to the 5D0 → 7F2 transition of the rare earth. Europium complexes absorption spectra in chloroform and electroluminescence spectra are presented. Current-voltage and luminance-voltage characteristics are also presented and we discuss about the results obtained with various molar concentration of Europium complexes in the PVK matrix.
Conference Committee Involvement (4)
Organic, Hybrid, and Perovskite Photovoltaics XXVI
3 August 2025 | San Diego, California, United States
Organic, Hybrid, and Perovskite Photovoltaics XXV
20 August 2024 | San Diego, California, United States
Organic, Hybrid, and Perovskite Photovoltaics XXIV
22 August 2023 | San Diego, California, United States
Organic, Hybrid, and Perovskite Photovoltaics XXIII
23 August 2022 | San Diego, California, United States
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